Sidi Adventure or Alpinestars Toucan are the best two options IMHO. They are a good compromise between protection and comfort/walkability. Both have goretex liners to keep feet dry.
Most of the other are made to look like dual-sport boots but donít have enough lateral (side-to-side) stiffness to properly protect in an off-road tumble from a fully-laden adventure bike.
Another (even tougher) option would be Alpinestars Tech 7 Drystar. Full enduro boot but with waterproof liner. Not so good for walking though.
When I did the Silk Road as part of London-Beijing, two riders had Forma Adventure boots. Both had the sole fall off one boot...